Background with roll over text plugin

Hi There,

I’m looking for a background manager that enables me to give each page a specific image and also te posibilty to add a lay over text with the photo discription. When you roll over this text you should be able to see the full description in a small pop-up or border.

I’ve found this plug-in, it does what I want to happen. Only 2 things it doesnt do is the specific page choice (which is not a big deal breaker) but I also cant modify the ‘[+]’ symbol to a text.

https://wordpress.org/plugins/background-manager/screenshots/

Any of you guys know a plug-in which does this? Or know how to modify the [+]?

Thanks a zillion.